CN114554925A

CN114554925A - Household dish washer

Info

Publication number: CN114554925A
Application number: CN202080070089.2A
Authority: CN
Inventors: 诺贝特·格斯特纳; 托马斯·施特克; 马里奥·马萨
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2019-10-07
Filing date: 2020-09-23
Publication date: 2022-05-27
Also published as: US20220338709A1; EP4041045A1; DE102019215312A1; WO2021069212A1

Abstract

The invention relates to a domestic dishwasher (1) having a washload receptacle (12) for receiving washloads and having a lifting device (16) for lifting the washload receptacle (12) from an initial position (AP) to an End Position (EP) and for lowering the washload receptacle (12) from the End Position (EP) to the initial position (AP), wherein the lifting device (16) comprises a spring element (20, 34) for supporting the lifting and lowering of the washload receptacle (12) by means of a supporting Force (FU) and a spring prestress adjusting unit (26, 35) for adapting the supporting Force (FU) to a loading state of the washload receptacle (12) by means of an adjustment of a spring prestress (FV) of the spring element (20, 34).

Description

Household dish washer

Technical Field

The present invention relates to a household dishwasher.

Background

A domestic dishwasher has a rinsing container and at least one rinse receptacle which can be moved into and out of the rinsing container. In particular, such a domestic dishwasher can have a plurality of rinsing-goods receptacles arranged one above the other, for example a lower basket, an upper basket or a cutlery drawer. Since the lower basket is arranged near the bottom of the rinsing container, the user needs to kneel or bend down to the lower basket in order to load or unload the lower basket. To simplify loading or unloading of the lower basket, a lifting mechanism can be provided. Here, there are passive lifting mechanisms which work by means of spring elements and active lifting mechanisms with drive elements, for example in the form of motors.

Documents DE 102012107993 a1 and DE 202009004771U 1 each disclose passive lifting mechanisms which operate by means of spring elements.

DE 102015201806 a1, EP 1066789 a1, WO 2005/104924 a1, US 6,247,771B 1, US 2006/0066189 a1, US 2007/0035220 a1 and US 2010/0045152 a1 each show a lifting mechanism which is operated by means of an electric motor as a drive element.

Disclosure of Invention

Against this background, it is an object of the invention to provide an improved domestic dishwasher.

A domestic dishwasher is therefore proposed, which has a washload receptacle for receiving washload and a lifting device for lifting the washload receptacle from an initial position into an end position and for lowering the washload receptacle from the end position into the initial position. The lifting device comprises a spring element for supporting the flushing contents in a raised and lowered position by means of a supporting force, and a spring prestress adjustment unit for adapting the supporting force to the loading state of the flushing contents by means of adjusting the spring prestress of the spring element.

By means of the spring prestress of the spring element being able to be varied by means of the spring prestress adjustment unit, the support force can always be adapted, so that a comfortable actuating force for raising and lowering the flushing contents can be achieved for the user. This improves the operating comfort.

Preferably, the domestic dishwasher comprises a washing container in which washing stock can be accommodated. In particular, a domestic dishwasher has a plurality of washload receptacles. For example, three rinsing product receptacles can be arranged one above the other in the rinsing container, wherein a lower rinsing product receptacle or lower basket, an upper rinsing product receptacle or upper basket and a cutlery drawer can be provided. In particular, the lower wash receptacle can be transferred from the initial position to the end position and vice versa by means of the lifting device. Preferably, the lower wash-ware receptacle is arranged approximately at the level of the upper wash-ware receptacle in the end position. This enables simple loading and unloading of the lower wash-ware receptacle.

In this case, the spring element can be understood in particular as "supporting" the lifting and lowering in that the lifting is not carried out solely by the supporting force of the spring element, but rather the user exerts a actuating force on the wash-load receptacle in order to move it from the initial position into the end position. The spring prestress, in turn, changes when the contents are transferred from the end position to the initial position, so that the user does not have to work excessively against the support force to transfer the contents from the end position to the initial position. It is therefore particularly preferred that the actuating force is independent of the loading state of the contents. In particular, the operating force is constant or constant.

"setting" of the spring prestress is understood in particular to mean that the spring element is stretched or compressed. The greater the spring prestress, the greater the support force. The support force "adapted" to the loaded state of the flushing-material receptacle is understood here to mean that the support force increases or increases with increasing load on the flushing-material receptacle. Conversely, the support force becomes smaller as the load decreases.

According to one embodiment, the domestic dishwasher further comprises a sensor device for detecting the loading state of the washload receptacle.

Preferably, the sensor means indirectly detects the loading state. That is to say, the loading state can be detected, for example, by detecting the weight of the flushing material contained in the flushing material container acting on the spring element. Alternatively, however, the loading state of the flushing contents can also be detected in other ways and methods, for example optically.

According to another embodiment, the sensor device has a strain gauge.

The sensor device can be part of a spring element. For example, the spring element has a cylindrical spring section, which is provided with a hook-shaped suspension section on its end face. For example, the sensor device can be arranged between the suspension section and the spring section in the form of one or more strain gauges. In particular, the strain gauge can be glued to the spring element.

According to another embodiment, the sensor device has a torque sensor.

Preferably, the torque sensor is arranged on a coupling plate, which is spring-prestressed by means of a spring element. The coupling plate can be connected, for example, fixedly to a pivot arm of the lifting device. In this case, the spring element exerts a torque on the pivot arm, wherein the acting torque can be detected by means of a torque sensor.

According to a further embodiment, the spring prestress adjustment unit has an adjustment element, in particular a stepping motor, for adjusting the spring prestress of the spring element.

The stepper motor can be, for example, a linear motor. However, the stepping motor can also be a rotating electrical machine. In the case of the adjusting element being a linear motor, the spring element can, for example, be coupled directly to the adjusting element. The adjustment element can thus be stretched or compressed to increase or decrease the prestress of the spring element.

According to a further embodiment, the spring prestress adjustment unit has an adjustment disk which is coupled with the adjustment element and the spring element, wherein the spring element is coupled eccentrically to the adjustment disk.

In particular, the adjusting element can be offset from the adjusting disk in a manner such that it can be rotated about the axis of rotation. "eccentric" means in the present case spaced apart from the axis of rotation of the adjusting disk. For example, the adjusting disk can have a cam or a bolt, wherein the spring element is suspended with its suspension section. The spring prestress adjusting unit can be fastened, for example, on a rinsing container of a domestic dishwasher.

According to another embodiment, the spring element is an extension spring, wherein the spring prestress adjusting unit extends the spring element to increase the spring prestress.

That is, the spring element is extended in order to increase the spring prestress. The spring prestress adjusting element enables a stepless transition of the spring element from an initial state with a minimum spring prestress to an end state with a maximum spring prestress via any number of intermediate states.

According to a further embodiment, the spring prestress adjustment unit has an engagement element, which is coupled to the adjustment element by means of a threaded spindle.

The threaded spindle can be part of the adjusting element. In particular, the adjusting element can be rotationally offset from the spindle. The engagement element can be a nut mounted on the threaded spindle, which nut moves linearly along the threaded spindle when the threaded spindle rotates.

According to another embodiment, the spring element is arranged between the engagement element and the lifting arm of the coupling disc.

For example, the coupling disc can be connected to one of the pivot arms of the lifting device as described above. On the coupling disc, the sensor device can be equipped with a torque sensor.

According to another embodiment, the spring element is a compression spring, wherein the spring pre-stress adjustment unit compresses the spring element to increase the spring pre-stress.

In particular, the spring element is compressed in such a way that the engagement element is moved toward the lifting arm of the coupling disk. To release the spring element, the engaging element is moved away from the lifting arm again.

Further possibilities for a domestic dishwasher also include combinations of features or embodiments not specified in the preceding or following examples. The expert can also add various points of view as an improvement or supplement to the corresponding basic concept of the domestic dishwasher.

Drawings

Further advantageous embodiments and aspects of the invention are the subject matter of the dependent claims and the following exemplary embodiments of the domestic dishwasher. Further, the household dishwasher is explained in detail with reference to the accompanying drawings according to preferred embodiments.

The figures show:

fig. 1 shows a schematic perspective view of an embodiment of a domestic dishwasher;

fig. 2 shows a schematic side view of the domestic dishwasher according to fig. 1;

fig. 3 shows another schematic side view of the domestic dishwasher according to fig. 1;

figure 4 shows a schematic view of an embodiment of a drive mechanism of a household dishwasher lifting device according to figure 1;

fig. 5 shows another schematic view of the drive mechanism according to fig. 4;

fig. 6 shows another schematic view of the drive mechanism according to fig. 4;

FIG. 7 shows a schematic diagram of the course of the force profile during the lifting of the washload container of the domestic dishwasher according to FIG. 1;

fig. 8 shows a schematic view of a further embodiment of the drive mechanism of the lifting device of the domestic dishwasher according to fig. 1;

fig. 9 shows another schematic view of the drive mechanism according to fig. 8;

fig. 10 shows another schematic view of the drive mechanism according to fig. 8; and is

Fig. 11 shows a schematic diagram of the course of the force profile during the lifting of the washload container of the domestic dishwasher according to fig. 1.

Elements that are the same or functionally the same in the drawings have the same reference numeral, unless otherwise indicated.

Detailed Description

Fig. 1 schematically shows a perspective view of an embodiment of a domestic dishwasher 1. The domestic dishwasher 1 comprises a rinsing container 2 which can be closed, in particular watertight, by a door 3. For this purpose, a sealing ring can be provided between the door 3 and the rinsing container 2. Preferably, the rinsing container 2 is square. The rinsing container 2 can be arranged in a housing of the domestic dishwasher 1. The rinsing container 2 and the door 3 can form a rinsing chamber 4 for rinsing the rinsing product.

Fig. 1 shows the open position of the door 3. The door 3 can be closed or opened by pivoting about a pivot axis 5 provided at the lower end portion of the door 3. The filling opening 6 of the rinsing container 2 can be closed or opened by means of the door 3. The rinsing container 2 has a bottom 7, a top cover 8 opposite the bottom 7, a rear wall 9 opposite the closed door 3, and two

opposite side walls

10, 11. The bottom 7, the top cover 8, the rear wall 9 and the

side walls

10, 11 can be made of stainless steel plate, for example. Alternatively, the bottom 7 can be made of a plastic material, for example.

The domestic dishwasher 1 also has at least one washload receptacle 12 to 14. Preferably, a plurality of, for example three, rinse receptacles 12 to 14 can be provided, wherein the rinse receptacle 12 can be a lower rinse receptacle or a lower basket, the rinse receptacle 13 can be an upper rinse receptacle or an upper basket, and the rinse receptacle 14 can be a cutlery drawer. As fig. 1 also shows, the flushing product holders 12 to 14 are arranged one above the other in the flushing container 2. Each flushing contents 12 to 14 can optionally be moved into or out of the flushing container 2. In particular, each washload receptacle 12 to 14 can be inserted or moved into the wash container 2 in an insertion direction E (arrow) or can be withdrawn or moved out of the wash container 2 in a withdrawal direction a (arrow) opposite to the insertion direction E (arrow).

As shown in fig. 2 and 3, the lower flushing part, such as the receptacle 12, is guided into the secondary flushing container 2 by means of a guide device 15. The guide means 15 can be a so-called telescopic rail. Preferably, such guiding means 15 are provided on both sides of the flushing contents 12. The flushing product holder 12 can be moved out of the flushing container 2 in the withdrawal direction a (arrow) or into the flushing container 2 in the insertion direction E (arrow) by means of the guide device 15. A wash, such as the receptacle 12, generally represents a lower wash receptacle or lower basket.

The household dishwasher 1 further comprises a lifting device 16, by means of which the washload receptacle 12 can be lifted from the initial position AP shown in fig. 2 to the end position EP shown in fig. 3. Conversely, the flushing-product holder 12 can be moved back again from the initial position AP to the end position EP by means of the lifting device 16. In the initial position AP and the end position EP, the flushing product holder 12 is completely removed from the flushing container 2 in the extraction direction a (arrow) by means of the guide device 15.

In the end position EP, the flushing contents 12 are raised by means of the lifting device 16 approximately to the level of the upper flushing contents 13, not shown in fig. 2 and 3, so that the user does not have to bend down in order to load or unload the flushing contents 12. Preferably, the domestic dishwasher 1 comprises two such lifting devices 16, which are arranged on

opposite side walls

10, 11 of the washing container 2. However, reference is next made to only one lifting device 16. The lifting device 16 supports the lifting of the flushing contents receptacle 12 from the initial position AP to the end position EP by means of the supporting force FU. However, the lifting device 16 does not automatically lift the contents 12 from the initial position AP to the end position EP or lower them from the end position EP to the initial position AP, but the user additionally applies a manipulation force FB (arrow) to the contents 12.

The lifting device 16 can comprise a drive element which is not shown in fig. 2 and 3. The drive element can be a passive drive element. A "passive" driving element is at present understood as a driving element which is not fed with additional energy. In contrast to this, an "active" driving element is understood to be a driving element to be fed with additional energy. For example, the motor is an active drive element.

The lifting device 16 can comprise a guide device 15. Furthermore, the lifting device 16 comprises a first pivot arm 17 and a second pivot arm 18. In the initial position AP, the

pivot arms

17, 18 are arranged parallel to each other and extend from top to bottom in the orientation of fig. 2. The

pivot arms

17, 18 can be connected to the flushing container 2, in particular to the

side walls

10, 11 of the flushing container 2, with the respective first end sections being rotatable. Furthermore, the

pivot arms

17, 18 can each be connected to the guide device 15 in a rotatable manner with a second end section facing away from the first end section.

Further, the lifting device 16 includes a drive mechanism 19A shown in fig. 4 to 6. The drive mechanism 19A comprises a spring element 20. The spring element 20 is a cylindrical spring. The spring element 20 can be an extension spring. The spring element 20 comprises a spring section 21, which is configured, for example, as a helical coil. Furthermore, the spring element 20 comprises, for example, hook-shaped

suspension sections

22, 23, with which the spring element 20 can be connected, for example, to the lifting device 16 and/or the rinsing container 2. The spring section 21 is arranged between the two

suspension sections

22, 23.

Further, the drive mechanism 19A includes a sensor device 24 for detecting the loading state of the flushing contents container 12. The "loaded state" is understood in the present case to mean the degree to which the flushing substance holder 12 is filled with flushing substance and/or the weight of the flushing substance held in the flushing substance holder 12. The sensor device 24 can be part of the spring element 20 or arranged on the spring element 20, for example. As shown in fig. 4 to 6, the sensor device 24 can be arranged between the spring section 21 and the suspension section 23.

The drive mechanism 19A further comprises a spring prestress adjustment unit 26, by means of which the spring prestress FV (arrow) of the spring element 20 can be adjusted. The spring prestress adjustment unit 26 comprises a circular adjustment disk 27 and an adjustment element 28, by means of which the adjustment disk 27 can be rotated about a rotational axis 29. The adjusting element 28 can be, for example, a stepping motor. A cam or a bolt 30 is provided eccentrically on the adjusting disk 27, i.e. at a distance from the axis of rotation 29, in which the suspension section 22 of the spring element 20 is suspended. For example, the spring prestress adjustment unit 26 can be fixedly connected to the rinsing container 2. The suspension section 23 of the spring element 20 is suspended in a further cam or bolt 31. The bolt 31 can be coupled, for example, to one of the

pivot arms

17, 18.

The function of the drive mechanism 19A is explained next. The adjusting disk 27 can be rotationally offset by means of an adjusting element 28. The direction of rotation D (arrow) of the adjustment disk 27 can be oriented clockwise. However, the direction of rotation D (arrow) of the adjustment disk 27 can also be oriented counterclockwise. In this case, the spring element 20 is transferred steplessly from an initial position AZ, shown in fig. 4, in which the spring prestress FV (arrow) is minimal, via any number of intermediate positions ZZ into an end position EZ, in which the spring prestress FV (arrow) is maximal.

The rotation of the adjustment disk 27 depends on the loading state of the flushing-product container 12 detected by the sensor device 24. That is, the greater the loading and weight of the contents 12, the greater the spring prestress FV (arrow) and the greater the holding force FU (arrow) when lifting the contents 12 from the initial position AP to the end position EP. That is, the user must always apply approximately the same operating force FB (arrow) to lift the contents 12 from the initial position AP to the end position EP regardless of the loaded state of the contents 12. Therefore, the drive mechanism 19A does not automatically lift the wash-target container 12, but the user supports it while lifting with the supporting force FU. The holding force FU (arrow) depends on the loading state of the flushing contents holder 12, as described above. Preferably, however, the actuating force FB (arrow) which the user has to exert himself is not dependent on the loading state. Preferably, the operating force FB (arrow) is constant or unchanging.

The drive mechanism 19A, in turn, also supports the lowering of the flushing contents 12 from the end position EP to the initial position AP. The holding force FU (arrow) also depends on the loading state of the flushing contents holder 12. That is, when the wash-out receptacle 12 is empty or lightly loaded, the spring prestress FV (arrow) is reduced, so that the user does not have to press the wash-out receptacle 12 downward against the spring element 20. Conversely, the spring prestress FV (arrow) is increased in the case of a large loading capacity, so that the contents 12 are not moved uncontrollably from the end position EP into the initial position AP. Therefore, the operating force FB which the user has to apply is also independent of the loading state of the wash-target receptacle 12 when the wash-target receptacle 12 is lowered. Preferably, the operating force FB (arrow) is constant or unchanging.

Thus, the drive mechanism 19A is semi-passive. Thus, the lifting device 16 can be referred to as a semi-passive lifting device 16. By means of the drive 19A, the supporting force FU (arrow) can be adapted to the loading of the flushing contents receptacle 12. It is therefore possible to achieve an improved support of the load weight in comparison with lifting devices which do not have such a spring prestress adjusting unit 26 but only have spring elements. In particular, the manipulation force FB (arrow) can be kept in a comfortable range for the user. Thereby improving operating comfort.

Fig. 7 schematically shows a diagram assigned to the drive mechanism 19A, in which the force in newtons is referenced to the lifting height in millimeters. Here, the fully loaded wash-target container 12 is shown in solid lines. The empty rinse-substance holder 12 is indicated by a dashed line and the necessary actuating force FB (arrow) which has to be applied to lift the rinse-substance holder 12 from the initial position AP to the end position EP is indicated by a dashed-dotted line. In this case, the arrow with the reference numeral 32 indicates the release of the spring element 20 and the arrow with the reference numeral 33 indicates the tensioning of the spring element 20. The spring element 20 is tensioned or relaxed by loading or unloading the flushing contents 12 in order to achieve a comfortable actuating force FB (arrow).

Fig. 8 to 10 show another embodiment of the drive mechanism 19B for the lifting device 16. The drive mechanism 19B comprises a spring element 34, which is configured as a compression spring. The drive mechanism 19B further includes a spring prestress adjusting unit 35 for adjusting the spring prestress FV (arrow) of the spring element 34. The spring prestress adjusting unit 35 has an adjusting element 36, for example a stepping motor. The adjusting element 36 has a threaded spindle 37 and an engaging element 38, into which the threaded spindle 37 is inserted. The engagement element 38 can be a nut. The engagement element 38 moves along the threaded spindle 37 when the threaded spindle 37 is rotated, as indicated by the double arrow 39. The spring element 34 rests against the engagement element 38. For example, the spring prestress adjusting unit 35 is fixedly installed at the rinsing container 2.

The drive mechanism 19B also includes a coupling plate 40 having a lift arm 41. The spring element 34 rests against the lifting arm 41. The coupling disc 40 is coupled, for example, to the pivot point of the

pivot arms

17, 18 of the lifting device 16. The coupling disk 40 is equipped with a sensor device 42, which has a torque sensor 43. The braking element 44 can engage with the coupling disk 40 in a force-fitting manner and brake it, for example. The braking element 44 can have, for example, electromagnetically actuated studs 45, which cooperate with the coupling disk 40.

Like the drive mechanism 19A, the spring element 34 can be transferred steplessly from an initial state AZ, in which the spring element 34 has a minimum prestress, through any number of intermediate states ZZ, to an end state EZ, in which the spring element 34 has a maximum prestress. The spring prestress FV (arrow) is therefore greater in the end state EZ than in the initial state AZ. In other respects, the function of the drive mechanism 19B corresponds to the function of the drive mechanism 19A.

Fig. 11 shows a schematic diagram of the drive mechanism 19B, in which the force in newtons is referenced to the lifting height in millimeters. The maximum spring prestress FV (arrow) that has to be applied is indicated by a dotted line. The minimum spring prestress FV (arrow) is shown in solid line. The maximum force variation process or the minimum force variation process during lifting is indicated by a dot-dash line or a dashed line.

Although the present invention has been described in terms of embodiments, various modifications can be made to the invention.

List of reference numerals

1 household dish washer

2 rinsing container

3 door

4 flushing chamber

5 pivoting axis

6 filling opening

7 bottom

8 Top cover

9 rear wall

10 side wall

11 side wall

12 receiver for irrigant

13 accommodating part for washing articles

14 receiver for irrigant

15 guide device

16 lifting device

17 pivoting arm

18 pivoting arm

19A driving mechanism

19B driving mechanism

20 spring element

21 spring section

22 hanging section

23 hanging section

24 sensor device

25 strain gauge

26 spring prestress adjusting unit

27 adjusting disc

28 adjusting element

29 axis of rotation

30 bolt

31 bolt

32 arrow head

33 arrow head

34 spring element

35 spring prestress adjusting unit

36 adjusting element

37 leading screw

38 engaging element

39 double arrow head

40 coupling disc

41 lifting arm

42 sensor device

43 Torque sensor

44 braking element

45 column

A drawing direction (arrow)

AP initial position

Initial state of AZ

D Direction of rotation (arrow head)

E insertion direction (arrow)

EP end position

EZ end State

FB manipulating force (arrow)

FU holding power (arrow head)

FV spring prestress (arrow head)

ZZ intermediate state.

Claims

1. A domestic dishwasher (1) having a washware receptacle (12) and a lifting device (16), for receiving a flushing object, for lifting the flushing object holder (12) from an initial position (AP) to an End Position (EP) and for lowering the flushing object holder (12) from the End Position (EP) to the initial position (AP), wherein the lifting device (16) comprises a spring element (20, 34) and a spring prestress adjustment unit (26, 35), for supporting the rising and lowering of the flushing-material receptacle (12) by means of a supporting Force (FU), the spring prestress adjustment unit adapts the supporting Force (FU) to the loaded state of the flushing-product receptacle (12) by means of an adjustment of the spring prestress (FV) of the spring element (20, 34).

2. A household dishwasher (1) as in claim 1, further comprising sensor means (24, 42) for detecting the loading status of the washload container (12).

3. A household dishwasher (1) as in claim 2, characterized by the sensor device (24) having a strain gauge (25).

4. A household dishwasher (1) as in claim 2, characterized by the sensor device (42) having a torque sensor (43).

5. Household dishwasher (1) according to one of the preceding claims, characterized in that the spring prestress adjusting unit (26, 35) has an adjusting element (28, 36), in particular a stepping motor, for adjusting the spring prestress (FV) of the spring element (20, 34).

6. A domestic dishwasher (1) as in claim 5, characterized by the spring pre-stress adjustment unit (26) having an adjustment disk (27) coupled with the adjustment element (28) and the spring element (20), wherein the spring element (20) is eccentrically coupled to the adjustment disk (27).

7. A household dishwasher (1) as in claim 5 or 6, characterized by the spring element (20) being an extension spring, wherein the spring pre-stress adjustment unit (26) extends the spring element (20) to increase the spring pre-stress (FV).

8. A domestic dishwasher (1) as in claim 5, characterized by the spring pre-stress adjustment unit (35) having an engagement element (38) which is coupled with the adjustment element (36) by means of a lead screw (37).

9. A household dishwasher (1) as in claim 8, characterized by the spring element (34) arranged between the engagement element (38) and a lifting arm (41) of a coupling disc (40).

10. A household dishwasher (1) as in claim 8 or 9, characterized by the spring element (34) being a compression spring, wherein the spring pre-stress adjustment unit (35) compresses the spring element (34) to increase the spring pre-stress (FV).